Citrus Bioflavonoids

Citrus flavonoids · Citrus bioflavonoid

Snapshot

Indications	Contraindications
Endothelial function¹ Prediabetes glycemic markers² Senile purpura³ Metabolic syndrome risk factors⁴ Periodontal pathogen load⁵ Menopausal symptoms⁶	Pregnancy or nursing⁷ Prescription medication use⁸ Planned surgery⁷

Citrus bioflavonoids are the flavanone-rich compounds in citrus peel and pulp, including hesperidin, naringin, and eriocitrin, and they act largely through antioxidant and anti-inflammatory effects on the vascular wall and metabolic tissues. Supplementation is used for vascular and endothelial support, for glycemic and lipid markers in metabolic risk, and for skin bruising in older adults. Vitamin C combinations and autoimmune conditions are also reached for, where the trials are mixed. Typical patients are middle-aged or older adults with cardiometabolic risk or fragile capillaries.

Human research is limited to about eighteen mostly small trials, covering endothelial function, prediabetes, lipids, periodontal disease, menopause, and senile purpura. A 2025 cell-model study found hesperidin and hesperetin inhibited SARS-CoV-2 spike-mediated syncytia formation, and no human trial has tested it. Products listing citrus bioflavonoids number in the thousands and come mainly as capsules and tablets, often combined with vitamin C or rutin; see Form comparison.

The pills carry the cautions. Health Canada labels ask for a practitioner's advice before use with prescription medication because citrus bioflavonoids may alter the effectiveness of these medications⁸. Per US product labels, blood-thinning medication is routed to a physician or pharmacist rather than avoided⁷.

Last updated October 16, 2026. Read how we make monographs.

In the full monograph

36 sources, 29 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources